Abstract
ABSTRACT
During the past ten years, emissions data have been obtained from a dry process cement kiln. The kiln has been tested while burning various amounts of hazardous waste solvents. Supplemental fuel in the form of hazardous waste solvents has been used up to 40% of the heat input to the kiln, or up to 140 million Btu/hr of the maximum 351 million Btu/hr heat input rate. Three sets of tests have been performed on this unit that can be used to compare the emissions from the burning of conventional fossil fuels only, and approximately 15%, 25% and 40% of the heat input with hazardous waste solvents. The tests were performed in 1982, 1984 and 1989/1990. As might be expected, burning a solid fuel has the potential for greater organic emissions, or products of incomplete combustion (PICs) than does the liquid hazardous waste solvents. Additionally, other impurities such as metals and chlorine content can be controlled more fully in liquid hazardous wastes than in conventional fuels. Full scale data from the kiln indicate that emissions can be reduced when burning a hazardous waste solvent over a conventional solid fossil fuel. However, these data were not obtained under controlled conditions, which would be as expected for most full scale facilities. These data could be augmented by bench and pilot scale studies that examine emissions for various hazardous waste and conventional fuel feed rates under controlled conditions.
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